<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图层 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        show-icon
        title="注意:只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
           @click="addDialogVisible=true" 
           type="primary" 
           size="mini" 
           :disabled="isBtnDisabled">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag 
                  v-for="(item,i) in scope.row.attr_vals" 
                  :key="i" 
                  closable 
                  @close="handleClosed(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini" 
                  type="primary" 
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button 
                  size="mini" 
                  type="danger" 
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
           @click="addDialogVisible=true" 
           type="primary" 
           size="mini" 
           :disabled="isBtnDisabled">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag 
                  v-for="(item,i) in scope.row.attr_vals" 
                  :key="i" 
                  closable 
                  @close="handleClosed(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button 
                  size="mini" 
                  type="danger" 
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <!-- 添加参数的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <!-- 添加参数的表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: "many",
      //动态参数的数据      
      manyTableDate:[],
      //静态属性的数据
      onlyTableDate:[],
      //控制添加对话框的显示与隐藏
      addDialogVisible:false,
      //添加参数的表单数据对象
      addForm:{
        attr_name:''
      },
      //添加表单的验证规则对象
      addFormRules:{
        attr_name:{required:true,message:'请输入参数名称',trigger:'blur'}
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible:false,
      //修改的表单数据对象
      editForm:{},
      //修改表单的验证规则对象
      editFormRules:{
        attr_name:{required:true,message:'请输入参数名称',trigger:'blur'}
      },
      //控制按钮与文本框的切换显示
      inputVisible:false,
      //文本框中输入的内容
      inputValue:'',
    };
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败!");
      this.catelist = res.data;
      //console.log(this.catelist);
    },
    //级联选择框中变化会触发这个函数
    handleChange() {
      this.getParamsData()

    },
    //Tab页签点击事件
    handleTabClick() {
      //console.log(this.activeName);
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableDate = []
        this.onlyTableDate = []
        return;
      }
      //根据所选分类的Id，和当前所处的面板，获取所对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败!");
      }
      res.data.forEach(item=>{
        item.attr_vals = item.attr_vals? item.attr_vals.split(' '):[]
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data);
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      }
      this.onlyTableDate = res.data
    },
    //添加对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid=>{
        if (!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,
        {
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮展示修改对话框
    async showEditDialog(attr_id){
      //查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
      {params:{attr_sel:this.activeName}})
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //重置修改表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮修改参数信息
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return 
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 200) return this.$message.error('修改参数失败!')
        this.$message.success('修改参数成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //根据Id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult = await this.$confirm('此操作将永久删除该数据, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).catch(err=>err)
      //用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }
      const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`,)
      if(res.meta.status !== 200) return this.$message.error('删除参数失败!')
      this.$message.success('删除参数成功!')
      this.getParamsData()
    },
    //文本框失去焦点或按下enter都会触发
    async handleInputConfirm(row){
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return 
      }
      //如果没有return 则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible =  false
      this.saveAttrVals(row)
    },
    //将对attr_vals的操作保存到数据库
    async saveAttrVals(row){
      //发起请求保存这次操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) return this.$message.error('修改参数项失败!')
      this.$message.success('修改参数项成功!')
    },
    //点击按钮展示文本输入框
    showInput(row){
      row.inputVisible = true
      //让文本框自动获取焦点
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数可选项
    handleClosed(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  created() {
    //获取所有的商品分类
    this.getCateList();
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //动态计算标题文本
    titleText(){
      if (this.activeName ==='many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
};
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>